This standard applies to the determination of nitrogen content in tungsten powder and tungsten bars. Measuring range: 0.0010~0.0050%.
GB/T 4324.26-1984 history
2012GB/T 4324.26-2012 Methods for chemical analysis of tungsten.Part 26:Determination of nitrogen content.Pulse heating inert gas fusion-thermal conductive method and the Nessler reagent spectrophotometry
1984GB/T 4324.26-1984 Methods for chemical analysis of tungsten--The Nessler reagent photometric method for the determination of nitrogen content